833e79a79a
being able to accurately provide the cool stuff that SVG is good for. :) There is a one-line bug on line 68 in the src/osgPlugins/svg/ReaderWriterSVG.cpp file where you can set the width in the Options string, but not the height."
120 lines
4.6 KiB
C++
120 lines
4.6 KiB
C++
/* -*-c++-*- Copyright (C) 2008 Miguel Escriva Gregori
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#include <iostream>
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#include <sstream>
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#include <osg/Image>
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#include <osg/Notify>
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#include <osgDB/Registry>
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#include <osgDB/FileNameUtils>
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#include <osgDB/FileUtils>
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#include <osgDB/ImageOptions>
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extern "C" {
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#include <librsvg/rsvg.h>
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#include <librsvg/rsvg-cairo.h>
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}
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class ReaderWriterSVG : public osgDB::ReaderWriter
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{
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public:
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ReaderWriterSVG()
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{
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supportsExtension("svg","Scalar Vector Graphics format");
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rsvg_init();
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}
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virtual const char* className() const { return "SVG Image Reader"; }
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virtual ReadResult readObject(const std::string& file, const osgDB::ReaderWriter::Options* options) const
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{
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return readImage(file, options);
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}
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virtual ReadResult readImage(const std::string& file, const osgDB::ReaderWriter::Options* options) const
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{
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std::string ext = osgDB::getLowerCaseFileExtension(file);
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if (!acceptsExtension(ext)) return ReadResult::FILE_NOT_HANDLED;
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std::string fileName = osgDB::findDataFile( file, options );
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if (fileName.empty()) return ReadResult::FILE_NOT_FOUND;
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RsvgDimensionData dimensionData;
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RsvgHandle* handle = rsvg_handle_new_from_file (fileName.c_str(), NULL);
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rsvg_handle_get_dimensions( handle, &dimensionData);
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osg::Image *image;
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if (options)
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{
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unsigned int w=0, h=0;
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std::string op = options->getOptionString();
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size_t i = op.find("x");
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std::stringstream ss1(op.substr(0, i));
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std::stringstream ss2(op.substr(i+1, op.size()));
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ss1 >> w;
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ss2 >> h;
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if (w==0 || h==0){
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image = createImage(handle, dimensionData.width, dimensionData.height);
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}
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else{
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image = createImage(handle, w, h);
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}
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}
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else{
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image = createImage(handle, dimensionData.width, dimensionData.height);
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}
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rsvg_handle_free(handle);
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image->setFileName(file);
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return image;
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}
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osg::Image* createImage(RsvgHandle *handle, unsigned int width, unsigned int height) const
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{
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RsvgDimensionData dimensionData;
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rsvg_handle_get_dimensions( handle, &dimensionData);
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// If image resollution < 128, cairo produces some artifacts.
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// I don't know why, but we check the size...
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if (width < 128) width = 128;
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if (height < 128) height = 128;
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width = osg::Image::computeNearestPowerOfTwo(width);
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height = osg::Image::computeNearestPowerOfTwo(height);
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osg::Image *image = new osg::Image();
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image->allocateImage(width, height, 1, GL_RGBA, GL_UNSIGNED_BYTE);
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image->setPixelFormat(GL_BGRA);
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cairo_surface_t *cairo_surface = cairo_image_surface_create_for_data(image->data(),
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CAIRO_FORMAT_ARGB32, width, height, image->getRowSizeInBytes());
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cairo_t *cr = cairo_create(cairo_surface);
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cairo_scale(cr,((float)width)/dimensionData.width, ((float)height)/dimensionData.height);
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rsvg_handle_render_cairo(handle, cr);
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cairo_destroy(cr);
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free(cairo_surface);
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image->flipVertical();
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return image;
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}
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protected:
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virtual ~ReaderWriterSVG()
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{
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rsvg_term();
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}
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};
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// now register with Registry to instantiate the above
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// reader/writer.
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REGISTER_OSGPLUGIN(SVG, ReaderWriterSVG)
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